Belleville washers and power transistors
Belleville washers and power transistors
(OP)
Does anybody have any experience with securing power transistors to heatsinks using belleville washers. I am interested in TO-220, TO-247 packages. Any info is appreciated.





RE: Belleville washers and power transistors
I would imagine that the force required make solid thermal contact is beyond the compression from the spring, or you'd wind up with one so stiff that you might as well have just bolted it together directly.
TTFN
RE: Belleville washers and power transistors
RE: Belleville washers and power transistors
The Belleville washer will also compensate for differences in interface pressure caused by cold flow of an (electrically) insulating washer, if one is being used. In high shock or vibration environments, it also plays a big
role in keeping a consistent pressure on the interface.
Check out this article: http://www.electronics-cooling.com/Resources/EC_Articles/MAY97/article3.htm which gives a more-than-you-wanted-to-know account of thermal interfaces.
RE: Belleville washers and power transistors
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